Keep vibe-coded UI on brand from the first prompt.

Vibe coding is fast because an agent makes hundreds of small decisions for you. DESIGN.md makes sure those decisions start with your brand, not an anonymous product template.

Create your DESIGN.md

Fast UI should not slowly become somebody else’s brand.

The first vibe-coded screen often looks convincing. The tenth is where the drift shows: a blue that is almost yours, softer corners than the rest of the product and copy that could belong to anyone. Each choice is small enough to approve. Together they erase the character people recognize.

Brand guidelines give the agent a fixed starting point without slowing down the work. Onefold converts your decisions into DESIGN.md, an instruction file designed to travel with every prompt and every new screen.

One file, the decisions agents need.

The brand you already have

Start from your live website, one color or a typeface. Onefold reads what you already ship and turns partial decisions into a coherent, usable system.

Guardrails for generated UI

Tell agents which visual clichés do not belong in your product, from decorative gradients to filler copy and unnecessary labels.

A faster review loop

When the baseline is in the file, agents stop adding a second component library or icon set, and reviews focus on the product idea instead of generic defaults.

Built for the way agents read a project.

1
Capture the choices people repeat in reviews.
The right starting point is not every Figma component. It is the handful of rules you keep correcting: color, type, space, shape and tone.
2
Export the brand as a project instruction.
DESIGN.md puts those rules next to the task, where vibe coding tools and repository-aware agents can use them before generating UI.
3
Evolve it as you build.
A design file is not a launch ceremony. Edit it when a decision changes, then the next generated screen starts from the new version.

Keep the speed. Lose the generic layer.

You do not need a mature design system to stop the drift. Start with the decisions that already make the product recognizable, and give every agent the same brief.

Start free